Characterisation of Epeiric “Layer‐cake” Carbonate Reservoirs: Upper Muschelkalk (Middle Triassic), the Netherlands

Abstract

Upper Muschelkalk (Middle Triassic) carbonates produce natural gas at Coevorden field in the NE Netherlands. This is currently the only field which produces gas from this succession although several other prospects have been identified nearby. In order to help develop these hydrocarbons, this study proposes a facies and reservoir model of the Upper Muschelkalk in the NE Netherlands together with a regional framework intended to assist in further evaluation. Distribution of facies and reservoir properties of the Upper Muschelkalk carbonates in the NE Netherlands indicate deposition on a storm‐dominated epeiric ramp with a very low gradient. The predominantly muddy and marly lithofacies types in proximal and distal parts of the ramp gradually interfinger with a shoreline‐detached “shoal”‐like ooidal grainstone complex. The best reservoir quality (permeability up to 60 mD) is recognised within dolomitised peloid ooid grainstones. These are interpreted as high‐energy backshoal deposits. Reservoir quality decreases in the limestone‐dominated “shoal” facies and the muddier foreshoal facies. A four‐fold hierarchy of depositional cycles describes the systematic and thus predictable vertical variation in reservoir quality (permeability) and quantity (net‐to‐gross). High‐resolution correlation suggests that medium‐scale cycles (5 to 15 metres thick) can be traced for hundreds of kilometres. Small‐scale cycles (1 to 3 metres thick) are persistent for several tens of kilometres and have sheet‐like geometries. Individual reservoir units (several decimetres thick) appear to be laterally continuous over a maximum of a few kilometres although internal flow barriers might be expected. Mapping of Upper Muschelkalk thickness and facies has clearly defined backshoal, ”shoal and foreshoal facies belts with distinctly different reservoir characteristics. Typically, reservoir quality and quantity decrease with increasing thickness of the Upper Muschelkalk and the underlying Middle Muschelkalk halite. The systematic variations in thickness are apparently controlled by a combination of palaeogeography and palaeotectonics. The best reservoir quality and highest quantity is found on a palaeohigh characterised by a relatively thin Upper Muschelkalk succession and the absence of underlying halite. These features can also be recognised in seismic data. The results of this case study can also be applied in the integrated characterisation of similar epeiric carbonates constituting highly productive reservoirs in the Middle East, including the Khuff and Arab Formations.

Facies models of a shallow-water carbonate ramp based on distribution of non-skeletal grains (Kimmeridgian, Spain)

“…A major diYculty is the large lateral extent of these types of sedimentary systems, the absence of recent analogues, and the diVerences between the climatic and oceanic parameters of icehouse and greenhouse intervals (e.g., Burchette and Wright 1992;Aurell et al 1995;Wright and Burchette 1996). The knowledge of the geometry and lateral continuity of porous and permeable grain-supported facies is a key aspect for reservoir exploration and development strategies in ancient carbonate platforms (e.g., Borkhataria et al 2005). A signiWcant diVerence between recent rimmed platforms and ancient epeiric carbonate ramps is the lateral development and extent of carbonate shoals.…”

Analysis of Late Jurassic to Early Cretaceous algal debris-facies of the Plassen carbonate platform in the Northern Calcareous Alps (Germany, Austria) and in the Kurbnesh area of the Mirdita zone (Albania): a tool to reconstruct tectonics and palaeogeography of eroded platforms

“…Thus, storm reworking is a dominant sedimentary process in epeiric carbonate platforms (e.g. Borkhataria et al 2005). These prerequisites are important for our purpose, since the algal debris-facies of Elliott (1958), represented as quiet-water wackestone facies, seems to have been deposited in zone Z sensu Irwin (1965) as already discussed by Elliott (1968, p. 93, ''sediments deposited further out to sea'').…”

Aquifer configuration and geostructural links control the groundwater quality in thin-bedded carbonate–siliciclastic alternations of the Hainich CZE, central Germany

“…: 7/2016. eral continuity of aquifers and aquitards results in a "layercake" aquifer architecture which has been demonstrated for the Upper Muschelkalk of central Europe (Aigner, 1982(Aigner, , 1985Merz, 1987;Simon, 1997;Borkhataria et al, 2005). Secondary mineralizations, which indicate groundwater flow (for instance Liesegang banding), occur on limestone fracture walls.…”